Just bought a 600ct humi and need advice

[14holestogie]

Just for the sake of argument, you're going to fill that humi with sticks at a conservative estimate of about $2000.

Invest another $100 for peace of mind and get the beads.

Kitty litter may do well in a stable environment in the winter months, but it won't handle the humidity swings you'll see come the summer months.